Explanation:
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The correct answer is: money (though some praise might also be granted). Indeed, the concept is that output matters a great deal, and since employees are paid not by the hour but by each piece they manufacture; they have an incentive to produce as many pieces as possible.
The issue with this system is that it leads to horrendous abuses, where people will work themselves out until total exhaustion: since the amount paid for each piece is too low and a certain output is mandatory, which penalizes older, slower workers. In England and later in North America and the rest of the Industrialized world, this system has become known as the sweatshop system.
Answer:
During the Great Depression years, the Wagner act was passed which prevented employers from interfering with workers' unions and protests in the private sectors.
The fall of Rome in 476 was the result of more than a hundred years of civil wars and general instability that had already seen the empire divided into two, in 476 the Lombards invaded and sacked the city of Rome, deposing the last emperor and sending his crown to the eastern emperor (the eastern empire would last until 1453).
The short term effects include the establishment of the Lombards in Italy, the most important region of the old Empire, and the rise of many roman-germanic kingdoms. The long term effects include the ruralization of europe, with many people leaving the cities, and the rise of serfdom, a middle term between slavery and freedom.
Most of the time it is, unfortunately, low education. Rapid population increase isn't too far behind, but if a population lacks education there would be little room for the economy to increase and a rapid population increase would effect problems more associated with resources and living space, depending on the country/area.